Damper control



June 17, 1947.

J. PARSONS DAMPER-CONTROL Filed Aug. 19, 1944 W I pINVENTOR. BY X I A T TOE/V E Y Patented June 17, 1947 DAMPER CONTROL Robert J. Parsons, Schenectady, N. Y., assignor to Consolidated Car Heating Company, Inc.,

Albany, N. Y., a corporation of New York Application Augusti19, 1944, Serial No. 550,206

1 Claim. 1

This invention relates to heating and ventilating, particularly the heating and ventilating of a vehicle such as a bus or street car.

A principal object of this invention is the provision of a construction and arrangement whereby heated air may be diverted to a by-pass more or less by a valve or damper which may be moved by steps from a mid position to either extreme position, but will move from either extreme to a mid position in one movement.

Other objects and advantages will appear as the description of the particular physical embodiment selected to illustrate the invention progresses and the novel features will be particularly pointed out in the appended claims. 7

In describing the particular physical embodiment selected to illustrate the invention, reference will be had to the accompanying drawing.

The single figure of the drawing is a schematic or diagrammatic view of a device and arrangement embodying my invention.

In the figure, numeral l designates a conduit connecting to a source of heated fluid, preferably air. This conduit connects with a space to be heated. Intermediate the connection to the source of heated fluid and the space to be heated, the conduit is provided with an opening or bypass 2.

A valve or damper 3 is pivoted at 4 and is of such size that it just closes the opening or by-pass 2 when it is in the closed position, as shown in the figure in full lines. If swung upon the pivot 4 it may occupy various intermediate positions up to the full open position in which it completely obstructs the flow of heated air in the conduit I, and allows all of it to flow out through the opening or by-pass 2. A mid position, designated M in the drawing, is fixed for the damper 3. This mid position may be an actual geometrical or mechanical mid position or not. In fact in some cases it may be desirable to have the so-called mid position about one-third of the way toward the open position.

The damper 3 is connected by linkage 5 and 6 to a rotatable electric motor armature 1. This motor armature is caused to rotate in opposite directions by suitably passing electric current through what I will call the opening field winding 8 or the closing field winding 9.

A commutator drum, designated as a whole by C, is mechanically connected to and moves synchronously with the damper 3, that is, both are moved by the armature 1. This rotatable or oscillatable drum C has metallic conducting strips l0, H, I2, l3, I4 and I5 mounted thereon with which device 30., The bellows 33 is metallic fingers or brushes I6, l1, l8, I9, 20, 2|, 22 and 23 contact as w'll be more fully explained hereinafter. I

Relays, as 24, 25, 26, 21, 28 and 29 are provided by which suitable contacts are made or broken to complete or break circuits.

Means for governing motion armature 1 responsive to the temperature and changes thereof in the space to be heated are provided. This means may assume various forms. I prefer a vessel such as 30 containing a fluid 3| positioned in the space to be heated capillary tube, as 32, to a Sylphon or collapsible and expansible bellows 33. It is immaterial whether the bellows is placed directly in the space to be heated or is positioned at a convenient place, as shown, and operated by the thermostatic connected, as by a link 34, to a movable member 35, preferably pivoted as at 36, and spring-pressed by spring 31.

All parts of the device are shown in the sketch in the positions which they would assume if the temperature of the space than, say 56 F.

If with all of the parts in the position as shown in the figure, the temperature in the space to be heated rises to 56, the pivoted circuit closing arm 35 would contact with point 38. Current would then flow from positive terminal of a source, of potential to Divot 36, through arm 35, contact; point 38, wire 39, relay 21, and to the other ter-. minal of the source of potential or to common. Current flowing in the above traced path would energize relay 21 and would raise armature 46': without having any efiect, otherwise, upon the; system.

If the temperature in the space to be heated{ further rises to 57, pivoted circuit closing arm 35) would contact point 4| and current would flow." in a circuit as follows: source of potential, pivot 36, arm 35, contact point; 4|, wire 42, relay 26, and to the other terminal of the source. Current flowing in the above traced path would cause armature 42 to be raised and then current could flow in a path as follows: positive terminal of a source of potential, relay armature 42', wire 43, brush 29, segment I2, wire 44, segment l0, brush I6, wire 45, relay 29 and to the negative terminal of the source. Current flowing in the above traced path would energize relay 29 and raise armature 46. When armature 46 is raised, current could flow in a path as follows: positive terminal of a source of potential, front contact 14, relay armature 46, opening field coil 8 to junction 41 at which place the current,

and communicating by a l to be heated is lesspositive terminal of a.

direction that the damper 3 is moved towardopenposition and the drum C is moved to carry segment [2 out from under brushx2'il; Whenbrush 23 ceases to contact commutator'segment. 12. at.

what I have called the mid position, relay 29wi1l become deenergized and motor. armature '1: will' cease to rotate, leaving damper 3 in the mid position.

If the temperature of the space to be heated further increases, the controllingarrnature 35"will contact the contact point 54 so that current will flow in a path as follows: positive terminal of a source. of potential, pivot 36, circuit controlling arm 35, contact point 54, wire 55, relay Z5 and to the negative terminal of the source. Current in the above traced path will energize relay 25 and raise its armature 56 so-that' then current can flow ina' path as follows: positive terminal of a source ofpotential, armature 56, wire 51', brush i8, egment ll, wire. 43, segment [0, brush 16', Wire 45, relay 29, and to the negative terminal of the source. Current in the above traced path will again cause armature 36 to be raised and will so cause armature I to again rotate and move damper 3 to the 61 position, that is, until com-. mutator segment l l moves out from under brush I8 and breaks the circuit of relay Z9.

If-the temperature in the space to be heated further rises to 62, the-circuit controlling arm 35 will contact point 58 anda circuit willbe formed in which'current will now as follows: positive terminal of a source of potential, pivot 36,. circuit controlling arm 35, point 58, wire 59, relay 2 4, and to the negative terminal of the source. Current flowing in the above traced path will energize the relay 24' and cause armature 5|! toabe raised.

thereby forming a circuit in which current flows as follows: positive terminal of a source of potential, relay armature 60, wire 5 5, brush ll, commu-v tator segment Ill, brush [6, wire 45,.relay 23, and to the negative terminal of the source. flowing in the above traced path will again energize relay 23 and so cause its armature 3 to be raised thereby causing motor armature 1 to again rotate and move damper 3 to the fullopen position, that is, to the 62 position in which the Current and then as brush [9 is bearing at the 62 position on commutator segment 13, a circuit would be formed as follows: positive terminal of a source of potential, armature 56, wire 62, brush l9, commutator segment l3, wire 63, commutator segment l5, brush 23, wire 34, relay 28 and common. Current flowing in the above traced path would energize relay 28 and cause its armature 52 to be raised so that a circuit would be formed as follows: positive terminal of a source of potent,ial, fron t contact 65, armature 52, closing winding 9 and to. junction 41. At this point the cirqu t. would divide and one path would be through wire 48. andthe motor armature and the other through the opening winding 8 and relay armature 5 46,.to the back contact 15. The current flowing duct 1 is completely closed off from the space tobe heated, and is completely opened to the bypass or atmosphere. The motor will no longer rotate when the drum C has moved so that brushes l1 and is are no longer over segment 1.0, that is, when segment in moves beyond them.

If the temperature of the spaceto be, heated.

should fall whenall the parts are inthe 62 posi-. tion, then circuit controlling arm 35 would first break contact with contact 58 thereby denergizing relay 2 4, but no change in position of any of the otherparts would take place.

If the temperature of the space to be heated further falls to 61, circuit controlling arm 35? would breakcontact with the 61 contact point,

54 and would thereby denergize relay 25. Whenthis relay is deenergized, its armature 53 would make contact with wire 32 and so with brush I9 through the field windings 9 and 8 would, in

this case, be in such direction as to cause a reverse rotation of the motor armature 31 so that, the armature i would move so that the damper would be moved toward the closed position from the 62? position, and would in fact be moved to the mid" position, that is, the movement would continue until commutator segment l3 moves out froniunjder brush 1-9 at which time energization of relay 28 would cease.

If the temperature further dropped. below 5 circuit controlling arm 35 would break contact with contact 4| and so deenergize relay 26,.thus

causing armature 42 to contact wire- 6.6;.s0, that d a circuit would be formed as follows: positive,

terminal of a source of potential, relay armature.

42', wire'fifi; brushZl, commutator segment I4,

wire 63, commutator segment l5, brush 23, wire 64, relay 28; and to the'negative terminal of the source. Current fiowing'in the above traced path would energize relay 2B and cause its armature 52 to be'raised thereby again energizing the electricmotor armature and causethe linkage to move the damper 3 toward and tothe 57 position at which point the brush, 2| would become disconnected from'commutat'or segment:

l4 as that commutator segment moves out from underneath it;

If the temperature of the space to beheated drops still furtherso that it gets below 56, circuit controlling arm 35 breaks contact with contact 38 andsodeenergizes 2.1 so thatits armature ifl makes contact with wire 61 so that ajcircuit-isformed as follows: positive terminal "ofa.

source. of-- potential, relay armature ll];v wire, 61;

brush-'22; commutator segment'l5, brush23, wire. 64; relay= 28-and'to' the negative terminal, of the.

source.- Cur-rent flowing in the aboveftraced path would again energize relay 28"and. cause,

armature 52-to be raisedv and so electric motor armature l would be energized and the" linkage,

5 and fi would move'damper 3 tothe 5,6"pos'i.- tionor fullclosed position, atwhichi position the relay 28' would become deenergized because .COmrmutator segment l5would have m'ovedout from,

underneath brushes23 and 22, so thatlthe system will again be in the position andg con'diti'o'n,

as shown in-thefigure of the drawing.

From the hereinbefore given description.v it,

will be seenthat'my arrangement and 001K160,-

tions are such that a damper, such, as 3', ismoved from a full closed position, that" is, the 56 posi-' steps fromihe .mid position to I the full openpo sition:

i It. will also be seen'fromthe system andar rangement that when the damper is in a full open position it is movable to a mid position and then by steps to the full closed position.

Although I have particularly described one particular physical embodiment of the idea of means underlying my invention, nevertheless, I desire to have it understood that the form selected is merely illustrative but does not exhaust the possible physical embodiments of the idea of means underlying my invention.

What I claim as new and desire to secure by Letters Patent of the United States, is:

In a heating system, including, in combination: means responsive to the temperature in the space to be heated; means for supplying heated fluid; a duct between said second-named means and the space to be heated, said duct provided with an intermediate by-pass opening; a damper adapted to close and open said by-pass and open or close said duct; a rotary electric motor having an opening field coil and a closing field coil; a linkage between said motor and said damper whereby the damper may be operated to close or open said by-pass; a commutator provided with contact fingers and metallic strips also connected to said motor and operable synchronously with said damper; two motor relays each having front and back electrical contacts and each having an armature, the armature of one relay connected to the opening coil and the armature of the other relay connected to the closing coil; a plurality of operating electrical contacts and a pivoted contact lever, said electrical contacts positioned to be contacted successively as said contact lever is oscillated in one direction and to be disengaged as said contact lever is oscillated in an opposite direction, said pivoted leve connected to and operated by said first-named means; a governing relay associated with each operating electrical contact, each governing relay provided with an armature and the relays connected to the extreme point having one a front electrical contact only and the other a back electrical contact only, the other relays each having both front and back electrical contacts; electric circuits connecting said operating electrical contacts and said overning relays, whereby said relays are successively operated by said first-named means; electric circuits connecting the front and back electrical contacts of said governing relays, said commutator strips and contact fingers and said motor relays whereby the motor relays are operated; and electric circuits connecting the armatures and the front and back electrical contacts of said motor relays and said opening and closing field coils of said motor so that when the armature of on motor relay is up and the other down current will flow in said motor coils in one direction and when the armature of the one motor relay is down and the other up current will flow in said motor coils in an opposite direction whereby said motor is operated in reverse directions whereby the damper is operated to different positions between open and closed positions and means for supplying electrical energy to all of said circuits.

ROBERT J. PARSONS.

REFERENCES CITED The following references are of record in the file of this patent:

UNITED STATES PATENTS 

